What Is a Rolly?

The Rolly has to be one of those devices that where 30 years from now, you'll find it worth a bundle because of its super sleek, high tech, gotta-have-it look. The thing moves to the music (and voices, and animal sounds, and just about anything else that's audible). You just gotta view this thing below--

Oh, and just in case you gotta go--a Rolly is a moving MP3 player.